Core for the armatures of dynamos



(No Model.)

D. J. HAUSS. 00112 FOR THE ARMATURES OFIDYNAMOS. N0. 894,978. PatentedDec. 25, 1888.

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UNITED STATES PATENT OEEIcE.

DAVID J. IIAIISS, OF (IXCINNATL (lllIO.

CORE FOR THE ARMATURES OF DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 394,978, dated December25, 1888. Application filed December 31, 1887. Serial No. 259,526. (Nomodel.)

To aZZ whom it may concern:

Be it known that I, DAVID .I. HAUSS, of

Cincinnati, in the county of Hamilton and 1 State of Ohio, have inventeda new and useful Improvement in Armature-Cores, (Case A,) l

which improvement is fully set forth in the following specification andaccompanying drawings, in which Figure I is a side elevation, partly insec- 1 tion, of my improved armature-core. Fig. II is a side view,partly in section, of one end of an armature, showing a modified form ofthe core; Fig. III, enlarged perspective view of one end of core; Fig.IV, perspective view of the commutator bars or plates; Fig. V,perspective views of the disks employed in the construction of the core,and Fig. VI a partial central sectional view of the core.

This invention relates to armaturecores for electric dynamos or motors.In order to attain a maximum efficiency it is necessary to have thelowest internal resistance to rotate the wire of the armature as closeto the polepieces as possible, to have the magnetic field intense, andthe armature light. As solid iron cores produce eddy-currents, I haveespecially provided against this by my special form of construction, andas great difficulty is experienced in winding armatures, by the breakingof the insulation of the wires at the corners or ends of the core, Ihave so constructed the core that no danger from this source can occur.To attain these ends I build up the core of disks of thin metal andpaper, which are placed on the mandrel alternately, so as to form a coreof sutficient length; and these disks are compressed on the shaft bymeans of washers at each end and nuts on the mandrel or shaft. The corethus formed is turned down true, and at each end a square annular gainis turned in, and the corners of the gain are clothed with flexible orelastic insulating material to receive the wires which are wrappedacross the core from end to end, all of which will now be set forth indetail.

I would observe that as the core may be wound in a variety of ways, Ihave confined my present invention to the construction of the core andto the method employed to construct it preparatory to equipping it withwires.

In the drawings, A rtprcscnts the mandrel, having reduced ends l; Ipartially threaded at U and provided with nuts I).

E E represent iron disks and F paper disks, or composed of some otherinsulated material. These iron and paper disks are placed on the mandrelalternately, so as to form a core of the proper length. The disk at eachend is composed of a thick disk, G, of insulating material, and next tothe disk G is a similar thickened disk, II, of insulating material.These disks are preferably composed of some flexible or elasticmaterial, so as to form a cushion for the corners. Instead of having theinner flexible or thickened disk, II, a band, I, of some elasticinsulating material may be employed, as shown in Fig. II, to form acorner. It is essential that the insulating material used at the cornersshould be pliable or yielding, such as soft rubber or other pliable orflexible material. When the core has been formed by means of the disks EF G II, and the whole properly compressed into a solid body by means ofthe n uts D and the washers .I behind the n uts, the mani'lrcl is put ina lathe and the disks turned up true, and an annular gain, K, is turnedinto each end. 'lhese gains terminate at the thick disks ll.

7 In winding the core the wires are bent down over the corners, and asthe corners are protectcd by the thick elastic insulated disks noleakage would result should the insulated wrapping ot the wires belrm-tured or broken.

III I i III, I show the mandrel equipped with comnnitator-plates l Theseplates are shown in perspective in Fig. IV, in which their-inner endsare bifurcated to receive the ends of the wires which are wrapped on thecore. Before these plates are attached to the mandrel the latter iscovered with an insulating-sheet, M. This sheet M also extends beneaththe disks E F H II. The surface of the disks is also coated withinsulated material N lad'ore the wire is wrapped thereon.

I have not shown any particular method of securing-thecommutator-plates'L to the shaft; but this is not a material part of thepresent invention, and it is obvious that any suitable mechanical meansmay be employed for this purpose. I have merely shown them in this caseto illustrate the manner in which the,

forth.

3. A core for armatures, mounted on a shaft, having at each end anannular gain or recess lower than the surface of the core, both of thecorners forming the gain having flexible insulating material thereon,substantially as herein set forth.

4. A core for armatures, having at each end a diametrically-reduced diskof thick flexible insulating material, and next to the reduced disk athick disk of the same diameter as the core, composed of soft flexibleinsulating material, substantially as herein set forth.

5. The combination of amandrel and the laminated core secured togetherby Washers and nuts, and the end disks of soft flexible material forminginsulated corners, substantially as herein set forth.

6. A core composed of alternate iron and paper disks mounted on amandrel and coated exteriorly with a sheet of insulating material, incombination with flexible ends and corners of insulating material,substantially as herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand,this 30th day of November, 1887, in the presence of Witnesses.

DAVID J. HAUSS.

\Vitnesses:

F. M. DILLIE, J. S. ZERBE.

